FileInputstream和FileOutpunstream

package Z3_3;

import java.io.File;
import java.io.IOException;
import java.io.FileInputStream;
import java.io.FileOutputStream;

public class Zijie {
    
    public static void main(String[] args)throws Exception{
        File file=new File("src/5714.txt");
        FileInputStream fis=null;
        try {
            fis=new FileInputStream(file);
            int data;
            while((data=fis.read())!=-1){
                System.out.print((char)data);
            }
            System.out.println("\n还有未读字节："+fis.available());
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }finally{
            fis.close();
        }
    
    System.out.println("写入mijia");
    FileOutputStream fiss=null;
    try {
        fiss=new FileOutputStream(file,true);
        String str="\nmijia";
        byte[]linshi=str.getBytes();//将字符串转换成字节数组
        fiss.write(linshi,0,3);//传入参数，从第off，到len字符
    } catch (Exception e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }finally{
        System.err.println("close");
        fiss.close();
    }
    
    
    try {
        int data;
        fis=new FileInputStream(file);
        while((data=fis.read())!=-1){
            System.out.print((char)data);
        }
    } catch (Exception e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }finally{
        System.err.println("\nclose");
        fiss.close();
    }
    
    
    
    
    
    
    
    
    
    }    
}